19. O, and O. (ozone) are allotropes of oxygen. Buckminsterfullerene (C) is another allotrope of carbon. Based on these statements and the information in Model 4, propose a definition for
allotrope

How have the greenhouse gasses increased from the year 2000 to 2018

Read the chemical equation. 2c2h2 + 5o2 → 4co2 + 2h2o which of the following statements would be correct if one mole of c2h2 was used in this reaction? one mole of oxygen was used in this reaction. five moles of oxygen were used in this reaction. four moles of carbon dioxide were produced from this reaction. two moles of carbon dioxide were produced from this reaction.

How are the terms group and period used on the periodic table